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so a search on register_globals for more info, but basically to make sure you know where your data is coming from (for security reasons) you need to specify where to "grab" it from.

so when you have page.php?addjoke=yes

you want to get the information from that query string which is "get". There are otheres like, "post", "session" and "cookie" which all get information from those sources. You just need to specify exactly which one to look in